Luckily, the playpen is located at the edge of the party and isn’t being actively observed. Probably because its inhabitants usually can’t escape and are loud when they need something. All Laura has to do is wait for a distraction.
After about fifteen minutes, during which Laura can feel pressure building in her bladder, a distraction presents itself. The cake is brought out and everybody begins to sing. Laura quickly pushes the playpen over and crawls out. She looks back at the party. No one has noticed. Perfect!
Laura runs for where she stashed her niece’s bike earlier and bikes back to her brother’s house, all the while sucking on her pacifier without meaning to. She gets off the bike and walks up to the door, or rather, toddles, due to her thick diaper. Just as she reaches the door, her bursting bladder lets loose and she floods her diaper with pee. Laura’s jaw drops in shock. The pacifier falls out.
Devastated to have wet her diaper like the toddler she’s dressed as, things only get worse for Laura as she goes to open the door and discovers…